Table 2 Quality assessment of included 7 randomized controlled trials
Study | Level of evidence | Adequate Randomization method | Allocation concealment | Blinding of participants and personnel | Blinding of the outcome assessment | Incomplete outcome | Free of selective reporting | Free of other bias |
|---|---|---|---|---|---|---|---|---|
Lorio et al. [15] | Level I | Yes | Unclear | Unclear | Unclear | Yes | Yes | Yes |
Van den Brand et al. [16] | Level I | Yes | Unclear | Unclear | Unclear | Yes | Yes | Yes |
Miller et al. [17] | Level I | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Huang et al. [18] | Level I | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Cai et al. [19] | Level I | Yes | Yes | Unclear | Unclear | Yes | Yes | Yes |
Luo et al. [20] | Level I | Yes | Yes | Unclear | Unclear | Yes | Yes | Yes |
Peng et al. [21] | Level I | Yes | Unclear | Unclear | Unclear | Yes | Yes | Yes |